Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c66e32d24e214b33204446eb496ad965d96db4bad6cc345f500293eb3754edfc:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^